Vendor: Zipcores Electronic Systems Engineering S.L. Category: Filters Transforms

Half-band Nyquist Decimation Filter

FIR_DEC_N is a polyphase decimation filter that permits the down sampling of an input signal by any power of 2.

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Overview

FIR_DEC_N is a polyphase decimation filter that permits the down sampling of an input signal by any power of 2. The filter core is organized as a highly optimized systolic array, allowing the user to specify very large decimation factors while keeping resource costs to a minimum.

Input data is sampled on the rising clock-edge of clk when en is active high. Internally, the samples are filtered and decimated then presented at the output interface, y_out.

The output signal en_out is the output clock-enable signal that indicates when an output sample is valid. For instance, when decimating by a factor of 2, then en_out will have a duty cycle of 50% relative to the input clock-enable signal. When decimating by a factor of 4, the duty cycle will be 25% and so on.

Key features

  • Synthesizable, technology independent VHDL Core
  • Half-band polyphase decimation filter with a configurable decimation factor from 2 to 2N
  • FIR filter core implemented as an optimized 48-tap systolic array (24-taps per phase) for ultimate speed and minimal resource use
  • Configurable data and coefficient widths
  • Symmetric arithmetic rounding limits DC-bias problems
  • Saturation of output samples - no wrap
  • Ships with 14-bit coefficients giving 80 dB stop-band attenuation
  • Only 12 H/W multipliers used per decimate-by-2 stage
  • Supports input sample rates of up to 300 MHz+

Block Diagram

FIR_DEC_N block diagram

Applications

  • Decimation of signals after digital-down-conversion
  • Decimation by a wide range of factors from 2 to 2N
  • Reduction of input sample rate to make subsequent signal processing easier

Files

Product Sheet Download

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Specifications

Identity

Part Number
FIR_DEC_N
Vendor
Zipcores Electronic Systems Engineering S.L.
Type
Silicon IP

Provider

Zipcores Electronic Systems Engineering S.L.
HQ: Spain
Zipcores design and sell IP Cores for implementation on all semiconductor devices. Founded in 2008, we are a team of experienced Engineers with a broad knowledge of digital hardware design spanning various fields. Our specific areas of expertise include Digital Video, DSP, Digital Modulation and high-speed interfaces. We offer a wide range of IP Cores for a variety of applications from basic building blocks to more complex systems. Our cores are supplied as clear readable VHDL or Verilog source-code and are synthesizable across multiple technologies - whether it be FPGA, ASIC or SoC.
Contact Zipcores Electronic Systems Engineering S.L.

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Frequently asked questions about Filters and Transforms IP cores

What is Half-band Nyquist Decimation Filter?

Half-band Nyquist Decimation Filter is a Filters Transforms IP core from Zipcores Electronic Systems Engineering S.L. listed on Semi IP Hub.

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Engineers should review the overview, key features, supported foundries and nodes, maturity, deliverables, and provider information before shortlisting this Filters Transforms IP.

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